Various testing

• Unit testing – code unit – usually a function, usually run in a headless browser
  
• Integration testing – in real browsers, selenium webdriver, test common permutations
  
• Continuos intergation
• Regression testing
• Accessibility – keyboard support, HTML markup, ARIA attributes, color contrast

Chrome plugins

aXe
aXe Coconut

• End-to-end
• Automated/Manual
• Snapshot Testing (Jest, React Storybook, Storyshots)
• Visual Snapshot Testing – comparing snapshots

Writing Testable Code

Sources

Marcy Sutton on What’s the Deal With Testing? at SmashingConf Barcelona 2017